This bourbon sipper has been gaining steam in craft cocktails around the world since barman Jon Santer introduced it to San Francisco sometime in the early 00s as part of a promotion for Bulleit bourbon (get it? Bulleit… in a Revolver! Ha!). Santer calls for Tia Maria in his recipe, but use whatever coffee liqueur you like. We think it’s especially nice with a hard-to-find liqueur called Firelight, made in the Bay Area from exceptionally fine coffee.